1. in a way that cannot be seen
2. in a way that is not noticed or detected

Examples

• The magician made the coin disappear invisibly from his hand.
• Bacteria spread invisibly through the air.
• She moved invisibly through the crowd without being recognized.
• The changes happened so gradually they occurred almost invisibly.
• The security cameras were positioned invisibly around the building.
• His influence worked invisibly behind the scenes.